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      Thiocyanate assisted performance enhancement of formamidinium based planar perovskite solar cells through a single one-step solution process

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          Abstract

          Thiocyanate ammonium additives are found to improve the performance of FAPbI 3 based planar perovskite solar cells through a single one-step method.

          Abstract

          Thiocyanate ammonium (NH 4SCN) is introduced into the fabrication of formamidinium lead triiodide (FAPbI 3) films through one-step spin-coating. The promoted formation of black trigonal phase α-FAPbI 3 with better crystallinity has been observed after the addition of NH 4SCN, together with the supression of the formation of yellow hexagonal phase δ-FAPbI 3. Planar perovskite solar cells (PVSCs) based on NH 4SCN-assisted formed α-FAPbI 3 films with high quality present a highest power conversion efficiency of 11.44% when 30 mol% NH 4SCN is applied. Notably, the addition of NH 4SCN is found to enhance the moisture stability of the perovskite. As a result, the planar PVSCs with 30 mol% NH 4SCN additive show improved stability under ambient conditions (RH: 30–40%) over those based on pristine FAPbI 3. NH 4SCN simultaneously enhances the efficiency and moisture stability of FAPbI 3 based PVSCs through a single one-step solution method, facilitating their commercial fabrication and application.

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          Efficient luminescent solar cells based on tailored mixed-cation perovskites

          Researchers developed a perovskite solar cell with high power-conversion efficiency (>20%) and intense electroluminescence yield (0.5%).
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            Non-wetting surface-driven high-aspect-ratio crystalline grain growth for efficient hybrid perovskite solar cells

            Large-aspect-ratio grains are needed in polycrystalline thin-film solar cells for reduced charge recombination at grain boundaries; however, the grain size in organolead trihalide perovskite (OTP) films is generally limited by the film thickness. Here we report the growth of OTP grains with high average aspect ratio of 2.3–7.9 on a wide range of non-wetting hole transport layers (HTLs), which increase nucleus spacing by suppressing heterogeneous nucleation and facilitate grain boundary migration in grain growth by imposing less drag force. The reduced grain boundary area and improved crystallinity dramatically reduce the charge recombination in OTP thin films to the level in OTP single crystals. Combining the high work function of several HTLs, a high stabilized device efficiency of 18.3% in low-temperature-processed planar-heterojunction OTP devices under 1 sun illumination is achieved. This simple method in enhancing OTP morphology paves the way for its application in other optoelectronic devices for enhanced performance.
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              Perovskite solar cells: from materials to devices.

              Perovskite solar cells based on organometal halide light absorbers have been considered a promising photovoltaic technology due to their superb power conversion efficiency (PCE) along with very low material costs. Since the first report on a long-term durable solid-state perovskite solar cell with a PCE of 9.7% in 2012, a PCE as high as 19.3% was demonstrated in 2014, and a certified PCE of 17.9% was shown in 2014. Such a high photovoltaic performance is attributed to optically high absorption characteristics and balanced charge transport properties with long diffusion lengths. Nevertheless, there are lots of puzzles to unravel the basis for such high photovoltaic performances. The working principle of perovskite solar cells has not been well established by far, which is the most important thing for understanding perovksite solar cells. In this review, basic fundamentals of perovskite materials including opto-electronic and dielectric properties are described to give a better understanding and insight into high-performing perovskite solar cells. In addition, various fabrication techniques and device structures are described toward the further improvement of perovskite solar cells.
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                Author and article information

                Journal
                JMCAET
                Journal of Materials Chemistry A
                J. Mater. Chem. A
                Royal Society of Chemistry (RSC)
                2050-7488
                2050-7496
                2016
                2016
                : 4
                : 24
                : 9430-9436
                Affiliations
                [1 ]State Key Laboratory of Silicon Materials
                [2 ]MOE Key Laboratory of Macromolecular Synthesis and Functionalization
                [3 ]Department of Polymer Science and Engineering
                [4 ]Zhejiang University
                [5 ]Hangzhou 310027
                Article
                10.1039/C6TA02999J
                4d43bd9c-0f0b-4e52-8177-e2346c12122e
                © 2016
                History

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